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  Adsorbent for removing mercury using sulfided iron compounds containing oxygen and method of producing sameUSPTO Application #: 20060205591Title: Adsorbent for removing mercury using sulfided iron compounds containing oxygen and method of producing same Abstract: Disclosed herein is an adsorbent for removing mercury, which comprises sulfided iron compounds containing oxygen. In the adsorbent, iron compounds containing oxygen are sulfided to accumulate sulfur therein, thereby removing gaseous mercury. (end of abstract) Agent: Sheridan Ross PC - Denver, CO, US Inventors: Do-Hee Lee, Hyun-Ki Lee, Min-Soo Bae, Hyun-Myung Oh, Jihn-Koo Lee, Du-Soung Kim USPTO Applicaton #: 20060205591 - Class: 502400000 (USPTO) Related Patent Categories: Catalyst, Solid Sorbent, Or Support Therefor: Product Or Process Of Making, Solid Sorbent The Patent Description & Claims data below is from USPTO Patent Application 20060205591. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates, in general, to an adsorbent for adsorbing and removing mercury and, more particularly, to an adsorbent for removing mercury using sulfided iron compounds containing oxygen and a method of producing the same. [0003] 2. Description of the Related Art [0004] In accordance with accelerated industrialization after the industrial revolution, environmental pollution problems have rapidly been aggravated. Particularly, heavy metals discharged from a pollutant source give rise to serious worries. Among them, mercury has characteristics unlike other heavy metals, such as high volatility, strong harmfulness, and accumulation in the human body, thus it has been considered as a major pollutant. When it is discharged from a combustion device to atmospheric air, it is known to be almost completely discharged in a gas element state, unlike other heavy metals which are typically discharged in particulate form. [0005] According to current EPA (The U.S. Environmental Protection Agency) data, methods of removing mercury are classified into an activated carbon injection method, a carbon filter bed method, a selenium filter method, a treated activated carbon adsorption method, a wet scrubbing method, and the like. Among them, the method employing activated carbon has been frequently studied, but is problematic in that, since about 100,000 g of activated carbon must be used to remove 1 g of mercury, cost is increased, and although physically adsorbed mercury may be desorbed from the activated carbon, and it must be hermetically buried in an independent location. [0006] Many researchers have studied the use of sulfur in order to remove mercury, and studies of the addition of sulfur to oxides or hydroxides have frequently been made. In addition to the deposition of sulfur on activated carbon, recently, a method of depositing sulfur on a mesoporous substance to remove mercury has been suggested. However, the method has limited commercial value because of its high cost. [0007] Accordingly, in the present invention, iron compounds containing oxygen which compared with other oxides, is capable of being produced at low cost is employed as a mercury adsorbent. The iron compounds containing oxygen are sulfided to compensate for its low mercury adsorbing ability, thereby maximizing its mercury adsorbing ability. [0008] With respect to sulfidation, harmful hydrogen sulfide is discharged from industrial facilities, such as incinerators or power plants in landfills. Hydrogen sulfide which pollutes atmospheric air must be appropriately removed according to discharge regulations. Iron compounds containing oxygen may be used as the adsorbent for removing hydrogen sulfide, thereby spontaneously depositing sulfur on iron compounds containing oxygen. Using the above-mentioned mechanism, pollutants can be removed in conjunction with the sulfidation of low-priced iron compounds containing oxygen, and the waste adsorbent can be reused as the adsorbent for mercury, thereby assuring a resource regeneration effect. [0009] Currently, there is increased interest in the protection of the environment and the reuse of resources, therefore interest in the reuse of industrial wastes is growing. Particularly, there is high interest in the reuse of waste iron compounds containing oxygen which occupies a high proportion of industrial wastes. However, since reuse technologies have been insufficiently developed, all industrial waste is being buried under ground, causing resources to be wasted. [0010] Ferrous sulfate and ferric sulfate are hydrolyzed or treated with alkali to produce an iron compounds containing oxygen pigment, and are used as an aggregating agent in wastewater treatment, or, occasionally, are used as magnetic material or ferrite. However, in comparison with the amount of ferrous sulfate and ferric sulfate generated during a process of producing steel and titanium dioxide, the requirement and number of users for them are small, thus they are undesirably wasted in great amounts. Therefore, polyferric sulfate trades at a low price of 45 won/kg. The composition of the polyferric sulfate solution is described in Table 1. TABLE-US-00001 TABLE 1 Composition of polyferric sulfate solution Specific Fe.sup.3+ (SO.sub.4).sup.2- gravity concentration concentration pH Polyferric 1.45 11% or more 22% or more 0.1-1.0 sulfate [0011] Iron compounds containing oxygen may be generated as a byproduct in the course of treating a solution which is generated when scales and pollutants on surfaces of steel plates are washed with 18% hydrochloric acid in order to convert hot-rolled steel plates into cold-rolled steel plates during an iron manufacturing process, or may be produced from polyferric sulfate generated during a process of producing titanium oxide using a sulfuric acid method. [0012] The present invention provides a method in which iron compounds containing oxygen are produced at low price to remove mercury and then sulfided to be used as a mercury adsorbent. SUMMARY OF THE INVENTION [0013] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide an adsorbent for removing mercury, in which iron compounds containing oxygen are sulfided, and a method of producing the same. [0014] Another object of the present invention is to provide an adsorbent for removing mercury and a method of producing the same, in which iron compounds containing oxygen are created from polyferric sulfate generated in the course of producing titanium oxide using ilmenite, and is sulfided to adsorb mercury from exhausted gas and thus remove it. BRIEF DESCRIPTION OF THE DRAWINGS [0015] The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: [0016] FIG. 1 is a flow chart showing the production of an adsorbent for removing mercury according to the present invention; and [0017] FIG. 2 illustrates XRD results of iron compounds containing oxygen produced according to examples 1 to 4 of the present invention. DESCRIPTION OF THE PREFERRED EMBODIMENTS [0018] According to an aspect of the present invention, there is provided an adsorbent for removing mercury, which comprises sulfided iron compounds containing oxygen. According to another aspect of the present invention, there is provided a method of producing an adsorbent for removing mercury, which comprises sulfided iron compounds containing oxygen. [0019] Mercury which is treated with the adsorbent for removing mercury according to the present invention means general gaseous mercury, preferably gaseous mercury contained in exhausted gas, and more preferably gaseous mercury contained in gas exhausted from power plants or incinerators, or gaseous mercury which is exhausted from a mercury battery, a fluorescent mercury lamp, or an amalgam in dental service. In detail, it means gaseous mercury containing Hg.sup.0, HgCl, or HgCl.sub.2. [0020] As long as iron compounds containing oxygen which constitutes the adsorbent for removing mercury according to the present invention is capable of being sulfided to be used as the adsorbent, any type of iron compounds containing oxygen may be used. Iron compounds containing oxygen may be exemplified by FeO, Fe(OH).sub.2, Fe(OH).sub.3, FeO(OH), Fe.sub.2O.sub.3, and Fe.sub.3O.sub.4, and preferably includes amorphous spherical particles having an FeO(OH) structural formula. Continue reading... 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